Audio modelPreview
Gemini 3.1 Flash TTS
- Released
- -
- Data date
- September 24, 2026
- Model class
- Access
Gemini 3.1 Flash TTS Preview turns text into audio and supports expressive audio tags as well as steerable prompts. The API profile allows up to 8,192 input tokens and 16,384 audio output tokens.
Google’s current model catalog labels the endpoint a legacy TTS preview. For new production workloads, Google recommends Gemini 3.8 Flash TTS or Gemini 3.8 Flash-Lite TTS.
Specifications and access
| Specification | Value and source |
|---|---|
| Model class | Text-to-speechSource |
| Access | APISource |
| API model ID | gemini-3.1-flash-tts-previewSource |
| Input | TextSource |
| Output | AudioSource |
| Task | Speech generationSource |
| Supported details | Steerable prompts and tagsSource |
| Text input | Up to 8,192 tokensSource |
| Audio output limit | Up to 16,384 tokensSource |
| Capabilities | Expressive audio tags, steerable prompts, and multilingual speech generationSource |
Popularity
44.7 / 100
Sources and data date
| Type | Evidence and data date |
|---|---|
| Additional source | Google Gemini API model catalog (retrieved September 24, 2026) · Google Gemini API model catalog · Editorial description reviewed October 2, 2026 |
| Additional source | Google Gemini 3.1 Flash TTS model documentation · Editorial description reviewed October 2, 2026 |
| Additional source | OpenRouter: Popularity index (derived), CC BY 4.0 |
| Additional source | Vercel AI Gateway: Popularity index (derived), CC BY 4.0 |
| Additional source | Creative Commons Attribution 4.0 |